Vitamin D iri vhitamini uye iri zvakare steroid hormoni, kunyanya kusanganisira vd2 uye vd3, ine struess yakafanana. Vitamin D3 uye D2 vanoshandurwa kusvika ku25 hydroxyl vitamin D (kusanganisira 25-dehydroxyl vitamin D3 uye D2). 25- (oh) vd mumuviri wemunhu, yakagadzikana smart, yakanyanya kushushikana. 25-- immunochromatography uye inogona kupa mhedzisiro mukati memaminitsi gumi nemashanu.